Utilization method of waste heat from ferronickel smelting in rkef process

A nickel-iron and process technology, applied in the field of comprehensive utilization of waste heat in ferroalloy production, can solve the problems of large coal or metallurgical coke and electric energy consumption, large amount of slag in the smelting process, large energy consumption, etc., to reduce carbon "emission" and "sulfur" Emissions, obvious economic and social benefits, and the effect of saving the amount of pulverized coal

Active Publication Date: 2016-03-30
SICHUAN JINGUANG IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In ferronickel production, the RKEF process has developed the most rapidly. This process has mature technology, simple and easy-to-control equipment, and high production efficiency, and is accepted by more and more enterprises. Coke and electric energy, high energy consumption, high production cost, excessive slag in the melting process, high melting temperature, dust pollution, etc.
It can be seen that the drying kiln process, rotary kiln process and electric furnace process in the RKEF process all consume a lot of energy, which consumes a lot of energy and high production costs.

Method used

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  • Utilization method of waste heat from ferronickel smelting in rkef process

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Embodiment 1

[0023] A factory adopts RKEF process to produce ferronickel, the high temperature flue gas of electric furnace is 950℃, and the flue gas volume is 24370Nm 3 / h, the temperature is lowered to 750°C by mixing air in the air mixing chamber, and the flue gas volume becomes 29134Nm 3 / h, 400°C hot air is generated after heat exchange, and the air volume is 51048Nm 3 / h, hot air used as the secondary air for coal injection combustion in the rotary kiln can save 5942 tons of coal consumption per year; the flue gas temperature of the rotary kiln is 300 °C, and the flue gas volume is 90239Nm 3 / h, after the dust is collected by the cyclone dust collector, the temperature of the flue gas is reduced to 250°C, and then blown into the mixing chamber of the drying kiln by a high-temperature fan as a heat source for the drying kiln, which can save 6,297 tons of coal consumption per year. The two waste heat utilization can reduce "carbon" emission by 7904 tons and "sulfur" emission by 98 ton...

Embodiment 2

[0025] A factory adopts RKEF process to produce ferronickel, the high temperature flue gas of electric furnace is 1000℃, and the flue gas volume is 22628Nm 3 / h, the temperature is lowered to 750°C through the mixed air in the air mixing chamber, and the flue gas volume becomes 28158Nm 3 / h, 400°C hot air is generated after heat exchange, and the air volume is 49322Nm 3 / h, the hot air used as the secondary air for coal injection combustion in the rotary kiln can save 5,741 tons of coal consumption per year; the flue gas temperature of the rotary kiln is 350°C, and the flue gas volume is 88,235Nm 3 / h, after the dust is collected by the cyclone dust collector, the temperature of the flue gas is reduced to 300°C, and then blown into the mixing chamber of the drying kiln by a high-temperature fan as a heat source for the drying kiln, which can save 6,442 tons of coal consumption per year. The two waste heat utilization can reduce "carbon" emissions by 7868 tons and "sulfur" emi...

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Abstract

The invention discloses an RKEF process nickel-iron smelting waste heat utilizing method. The method comprises that electric furnace high-temperature flue gas is subjected to heat exchange with normal-temperature air by a heat exchanger, and then 350-450 DEG C hot air obtained from heat exchange is used as secondary air required for rotary kiln injection coal combustion and is sent into a rotary kiln for utilization. Further, high-temperature flue gas discharged by the rotary kiln is firstly dedusted, then blown into an air mixing chamber of a drying kiln by a blower to be mixed with high-temperature flue gas generated by a combustion chamber of the drying kiln, and thus obtained 350-450 DEG C flue gas as a heat source of the drying kiln is utilized. The method realizes full utilization of the electric furnace high-temperature flue gas; and the waste heat utilization method has high heat utilization rate, saves coal consumption, reduces carbon emissions and sulfur emissions in the atmosphere, and has obvious economic benefits and social benefits.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of waste heat in ferroalloy production, and specifically relates to a method for utilizing waste heat in ferronickel smelting in the RKEF process. Background technique [0002] Ferronickel is an important raw material for the production of stainless steel and heat-resistant cast steel, etc. Adding nickel to steel can improve the corrosion resistance of steel, improve the tensile strength, cold deformation and welding performance of steel, and is widely used in machinery, medical, national defense, Light industry and other fields. At present, nickel provided by ferronickel has accounted for more than 50% of the world's nickel demand, and my country has reached more than 75% in 2013, and the proportion will increase. [0003] In ferronickel production, the RKEF process has developed the most rapidly. This process has mature technology, simple and easy-to-control equipment, and high producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/06C22C1/02C22C19/03F27D17/00
CPCY02P10/25
Inventor 刘毅向花亮邓小东王文周向东
Owner SICHUAN JINGUANG IND GRP
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